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The purpose of this task is to quantify the sources of fuel oil soot and component chemicals deposited in the watershed. This information will be used in the Puget Sound model described in Sub-Task E. Work to be accomplished includes:
(a) Research existing studies to determine: 1) The quantities of various grades of fuel oils (including diesel fuels) used in various modes of transportation in the Puget Sound basin; 2) The chemical composition of soot emissions from those fuel oils used in mobile sources on and around the Puget Sound basin, particularly the quantities of specific toxic chemicals of concern identified by Ecology in Phase 1; 3) The dispersion of soot emissions before deposition from a variety of modes, speeds, and stack heights and in a variety of meteorological conditions; and 4) Quantities of land-deposited fuel oil soot emissions, or chemical derivatives attributable to fuel oil soot emissions, detected in stormwater run-off.
(b) Using available emission inventory data for the most recent complete data set of mobile source emissions, quantify toxic fuel oil emissions from all mobile sources proximate to Puget Sound. Include all emissions from roadways within 1 mile of the Sound; include all rail and yard emissions within 1 mile of Puget Sound; and include all marine emissions (ocean-going vessels, harbor craft, pleasure craft, port equipment) operating upon the marine waters and estuaries of Puget Sound and any fresh waters within 1 mile of the Sound.
(c) Research and develop seasonal average meteorological models for the year in which the most recent complete data set of emissions is available.
(d) Using the researched information, emissions inventory data, and meteorological models, project the expected emissions, dispersions, trajectories, and deposition based upon average annual weather patterns for the year. (If wet and dry dispersion and deposition rates differ significantly, model by season.) Plot emissions of fuel oil soot deposited onto the elements of a grid that covers the land, water, and tidelands of the Puget Sound watershed. Multiply the deposition of soot by the chemical concentrations in the soot to determine a deposition map of specific chemicals at different locations within the watershed from mobile source fuel oil soot emissions. Compare modeled dispersion data with available toxic chemical monitoring data, and recalibrate the models as necessary.
(e) Prepare a report on the findings of the gross quantities of fuel oil soot and component chemicals deposited to the watershed and on deposits of soot and component chemicals to the sub-areas of the watershed described by Ecology's Puget Sound model described in Sub-Task E.
(f) Research the population, average annual emissions, dispersion and deposition rates, and chemical composition of soot from woodstoves and fireplaces within 1 mile of the shorelines of the marine waters, estuaries, and freshwater of the Sound; and plot the deposition of wood smoke soot onto a similar grid map. Multiply the deposition of wood smoke soot by the chemical concentrations in the soot to determine a deposition map of specific chemicals at different locations within the watershed.
The Department of Ecology’s Air Quality Program will oversee this sub-task.
For more information, contact Doug Brown at 425-649-7082.
Copyright © Washington State Department of Ecology. See http://www.ecy.wa.gov/copyright.html.
